CN102709042B - Current transformer - Google Patents

Current transformer Download PDF

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Publication number
CN102709042B
CN102709042B CN201210209079.XA CN201210209079A CN102709042B CN 102709042 B CN102709042 B CN 102709042B CN 201210209079 A CN201210209079 A CN 201210209079A CN 102709042 B CN102709042 B CN 102709042B
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winding
coil
secondary coil
magnetic core
ancillary
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CN102709042A (en
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陈德才
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Zhejiang Enhong Electronics Co ltd
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Priority to PCT/CN2013/077581 priority patent/WO2013189297A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/38—Auxiliary core members; Auxiliary coils or windings

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The invention discloses a current transformer. One technical scheme is that the current transformer comprises a main magnetic core, auxiliary magnetic cores, a first coil, a second coil, maxillary coils, a load resistor connected with two ends of the second coil, and a detection resistor connected with two ends of the auxiliary coils, wherein the ratio of the resistance value of the detection resistor to the resistance value of the load resistor is equal to that of the turns of the auxiliary coils to the turns of the second coil; the first coil and the second coil are wound on the main magnetic core and the auxiliary magnetic cores; the auxiliary coils are wound on the auxiliary magnetic cores; the non-like ends of the auxiliary coils are connected with the like end of the second coil; the two ends of the first coil serve as the current input end; and the like ends of the auxiliary coils and the non-like end of the second coil serve as the signal output end. The current transformer has the characteristic of high measurement precision.

Description

A kind of current transformer
Technical field
The invention belongs to electrotechnical measurement Instrument technology field, be specifically related to a kind of current transformer.
Background technology
Current transformer is a kind of broad-spectrum electrotechnical measurement instrument, and it is widely used in industrial field device, electric power system and once protects and in control loop, and the basic performance requirement of current transformer has high certainty of measurement.
See Fig. 1, conventional current transformer is made up of magnetic core 1, primary winding 3 and secondary coil 4, when flowing through electric current in primary winding, due to electromagnetic induction, will electromotive force be induced in secondary coil, secondary coil 4 is connected with load resistance 6, then in secondary coil 4, produce secondary current, when secondary current flows through load resistance 6, produce signal voltage at the two ends of load resistance 6, this signal voltage is proportional to the electric current flowing through primary winding 3.The coil terminals in Fig. 1, indicating " * " is the Same Name of Ends of primary winding 3 or secondary coil 4.
Due to the existence of core reluctance, current transformer is in the process changing electric current, sub-fraction electric current must be consumed for excitation, magnetic core is magnetized, thus producing induced potential and secondary current at secondary coil, the exciting current that the measure error of current transformer consumes due to magnetic core causes.When not carrying out error compensation, the ratio difference of current transformer and phase angle difference are all increase along with the reduction of primary current, and conventional compensation method has fractional turns compensations, magnetic shunt compensation etc., but certainty of measurement after compensation is still lower.
Chinese patent literature CN201549350U discloses a kind of laminated iron core magnetic shunt compensating device of current transformer, it comprises stacked upper core, stacked lower core, secondary winding, magnetic shunt compensation winding, secondary winding is around on stacked upper core and stacked lower core, magnetic shunt compensation winding is around on stacked upper core, secondary winding and magnetic shunt compensation winding are in series, the non-linear certainty of measurement to current transformer of stacked upper core magnetic property is utilized to compensate, compensation rate depends on the magnetic property of stacked upper core and the number of turn of magnetic shunt compensation winding, the certainty of measurement of magnetic shunt compensation after-current instrument transformer is used all to obtain larger improvement, but the certainty of measurement after compensating is still lower.
In addition, Chinese patent literature CN87200450U discloses Double-cascade low magnetic flux capacity compensating current transformer, CN1022269C discloses double-auxiliary coupling compensation current transformer, and technique scheme all exists the low defect of the certainty of measurement after compensation.
Summary of the invention
The invention provides the current transformer that a kind of certainty of measurement is high.
The present invention adopts following multiple technologies scheme:
Technical scheme one: a kind of current transformer, comprise main magnetic core, auxiliary magnetic core, primary winding, secondary coil, ancillary coil, be connected to the load resistance at secondary coil two ends, be connected to the detection resistance at ancillary coil two ends, the ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of ancillary coil and the number of turn of secondary coil, primary winding and secondary coil are wound on main magnetic core and auxiliary magnetic core, ancillary coil is wound on auxiliary magnetic core, the non-same polarity of ancillary coil is connected with the Same Name of Ends of secondary coil, the two ends of primary winding are current input terminal, the Same Name of Ends of ancillary coil and the non-same polarity of secondary coil are signal output part, or the Same Name of Ends of ancillary coil and the two ends of secondary coil are signal output part, use when being three-polar output signal when needing the output of current transformer.
The 1st grade of current transformer is formed by main magnetic core, primary winding, secondary coil and load resistance.
The 2nd grade of current transformer is formed by auxiliary magnetic core, primary winding, secondary coil, ancillary coil and detection resistance.
For the 1st grade of current transformer, there is following equation:
Ip*Np-I1*Ns-Iz1*Ns＝0
Iz1＝E1/Z1
E1＝I1*R01+I1*R
Wherein: Np: the number of turn of primary winding;
Ns: the number of turn of secondary coil;
Ip: the electric current in primary winding;
I1: the electric current in secondary coil;
Iz1: the exciting current of main magnetic core;
E1: the induced potential on secondary coil;
Z1: the excitation impedance of main magnetic core;
R01: the impedance of secondary coil;
R: load resistance;
Solve above equation, then can obtain:
I1＝(Np/Ns)*Ip*(1-e1)
U1＝I1*R＝(Np/Ns)*Ip*R*(1-e1)
e1＝[(R01+R)/Z1]/[1+(R01+R)/Z1]
U1: the voltage on load resistance
The measure error of the 1st grade of current transformer is: e1, and is negative value.
For the 2nd grade of current transformer, there is following equation:
Ip*Np-I1*Ns-I2*Nf-Iz2*Nf＝0
Iz2＝E2/Z2
E2＝I2*R02+I2*Rf
Wherein: Nf: the number of turn of ancillary coil;
I2: the electric current in ancillary coil;
Iz2: the exciting current of auxiliary magnetic core;
E2: the induced potential on ancillary coil;
Z2: the excitation impedance of auxiliary magnetic core;
R02: the impedance of ancillary coil;
Rf: detect resistance;
I1=(Np/Ns) * Ip* (1-e1) is substituted into above equation and solves, then can obtain:
I2＝(Np/Nf)*Ip*e1*(1-e2)
e2＝[(R02+Rf)/Z2]/[1+(R02+Rf)/Z2]
The measure error of the 2nd grade of current transformer is: e2, and is negative value.
Because the ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of ancillary coil and the number of turn of secondary coil, therefore have:
Rf/R＝Nf/Ns
Voltage between the Same Name of Ends of ancillary coil and the non-same polarity of secondary coil is:
U＝I1*R+I2*Rf
U＝(Np/Ns)*Ip*R*(1-e1*e2)
U＝(Np/Ns)*Ip*R*(1-e)
e＝e1*e2
U: the voltage between the Same Name of Ends of ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and is negative value.
The measure error e of current transformer is the product of the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer, and therefore, the measure error e of current transformer is much smaller compared with the measure error e1 of the 1st grade of current transformer.
In addition, for the 2nd grade of current transformer, following equation is had:
Ip*Np-I1*Ns-I2*Nf-Iz2*Nf＝0
I1=(Np/Ns) * Ip* (1-e1) is substituted into aforesaid equation
Then have: (Ip*e1) * Np – I2*Nf-Iz2*Nf=0
Namely equivalence uses the 2nd grade of current transformer to detect electric current (Ip*e1), because electric current (Ip*e1) is more much smaller than the electric current I p in the input primary winding of the 1st grade of current transformer, therefore, the magnetic core that the magnetic core of the 2nd grade of current transformer can use small cross sections long-pending, namely the sectional area of auxiliary magnetic core can be less than the sectional area of main magnetic core, thus reduce the materials'use amount of current transformer, reduce the manufacturing cost of current transformer.
When the certainty of measurement of the current transformer of 2 grades more than using still can not meet the requirement to current transformer certainty of measurement, more multistage current transformer can be used to meet the requirement to current transformer certainty of measurement.
Technical scheme two: a kind of current transformer, comprise main magnetic core, n auxiliary magnetic core, primary winding, secondary coil, n ancillary coil, be connected to the load resistance at secondary coil two ends, be connected to the 1st ancillary coil two ends the 1st detects resistance, be connected to the 2nd ancillary coil two ends the 2nd detects resistance, until be connected to the n-th ancillary coil two ends n-th detects resistance, n be more than or equal to 2 integer, 1st ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 1st ancillary coil and the number of turn of secondary coil, 2nd ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 2nd ancillary coil and the number of turn of secondary coil, by that analogy, until the n-th ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the n-th ancillary coil and the number of turn of secondary coil,
Primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n-th auxiliary magnetic core, by that analogy, until the n-th ancillary coil is wound on the n-th auxiliary magnetic core;
The Same Name of Ends of secondary coil is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, until the Same Name of Ends of the (n-1)th ancillary coil is connected with the non-same polarity of the n-th ancillary coil;
The two ends of primary winding are current input terminal, and the Same Name of Ends of the n-th ancillary coil and the non-same polarity of secondary coil are signal output part; Or the Same Name of Ends of the n-th ancillary coil and the two ends of secondary coil are signal output part, use when being three-polar output signal when needing the output of current transformer.
The 1st grade of current transformer is formed by main magnetic core, primary winding, secondary coil and load resistance.
Detected resistance formed the 2nd grade of current transformer by the 1st auxiliary magnetic core, primary winding, secondary coil, the 1st ancillary coil and the 1st.
Detected resistance to the 2nd ancillary coil and the 2nd formed 3rd level current transformer by the 2nd auxiliary magnetic core, primary winding, secondary coil, the 1st ancillary coil.
By that analogy, until:
Detected resistance formed (n+1)th grade of current transformer by the n-th auxiliary magnetic core, primary winding, secondary coil, the 1st ancillary coil to the n-th ancillary coil and n-th.
For the 1st grade of current transformer, there is following equation:
Ip*Np-I1*Ns-Iz1*Ns＝0
Iz1＝E1/Z1
E1＝I1*R01+I1*R
Wherein: Np: the number of turn of primary winding;
Ns: the number of turn of secondary coil;
Ip: the electric current in primary winding;
I1: the electric current in secondary coil;
Iz1: the exciting current of main magnetic core;
E1: the induced potential on secondary coil;
Z1: the excitation impedance of main magnetic core;
R01: the impedance of secondary coil;
R: load resistance;
Solve above equation, then can obtain:
I1＝(Np/Ns)*Ip*(1-e1)
U1＝I1*R＝(Np/Ns)*Ip*R*(1-e1)
e1＝[(R01+R)/Z1]/[1+(R01+R)/Z1]
U1: the voltage on load resistance
The measure error of the 1st grade of current transformer is: e1, and is negative value.
For the 2nd grade of current transformer, there is following equation:
Ip*Np-I1*Ns-I2*Nf1-Iz2*Nf1＝0
Iz2＝E2/Z2
E2＝I2*R02+I2*Rf1
Wherein: the number of turn of the Nf1: the 1 ancillary coil;
Electric current in I2: the 1 ancillary coil;
The exciting current of the Iz2: the 1 auxiliary magnetic core;
Induced potential on E2: the 1 ancillary coil;
The excitation impedance of the Z2: the 1 auxiliary magnetic core;
The impedance of the R02: the 1 ancillary coil;
Rf1: the 1 detects resistance;
I1=(Np/Ns) * Ip* (1-e1) is substituted into above equation and solves, then can obtain:
I2＝(Np/Nf1)*Ip*e1*(1-e2)
e2＝[(R02+Rf1)/Z2]/[1+(R02+Rf1)/Z2]
The measure error of the 2nd grade of current transformer is: e2, and is negative value.
By that analogy, until:
For (n+1)th grade of current transformer, there is following equation:
Ip*Np-I1*Ns-I2*Nf1–……–I(n+1)*Nfn–Iz(n+1)*Nfn＝0
Iz(n+1)＝E(n+1)/Z(n+1)
E(n+1)＝I(n+1)*R0(n+1)+I(n+1)*Rfn
Rfn/R＝Nfn/Ns
Wherein: the number of turn of the Nfn: the n-th ancillary coil;
I (n+1): the electric current in the n-th ancillary coil;
Iz (n+1): the exciting current of the n-th auxiliary magnetic core;
E (n+1): the induced potential on the n-th ancillary coil;
Z (n+1): the excitation impedance of the n-th auxiliary magnetic core;
R0 (n+1): the impedance of the n-th ancillary coil;
Rfn: the n-th detects resistance;
Above equation is solved, then can to obtain:
I(n+1)＝(Np/Nfn)*Ip*e1*e2*…*[1-e(n+1)]
e(n+1)＝{[R0(n+1)+Rfn]/Z(n+1)}/{1+[R0(n+1)+Rfn)]/Z(n+1)}
The measure error of (n+1) level current transformer is: e (n+1), and is negative value.
Because the 1st ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 1st ancillary coil and the number of turn of secondary coil, 2nd ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 2nd ancillary coil and the number of turn of secondary coil, by that analogy, until the n-th ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the n-th ancillary coil and the number of turn of secondary coil, therefore have:
Rf1/R＝Nf1/Ns
Rf2/R＝Nf2/Ns
By that analogy, until:
Rfn/R＝Nfn/Ns
Voltage between the Same Name of Ends of the n-th ancillary coil and the non-same polarity of secondary coil is:
U＝I1*R+I2*Rf1+……+I(n+1)*Rfn
U＝(Np/Ns)*Ip*R*[1-e1*e2*……*e(n+1)]
U＝(Np/Ns)*Ip*R*(1-e)
e＝e1*e2*……*e(n+1)
Voltage between the Same Name of Ends of the U: the n-th ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and is negative value.
The measure error e of current transformer is that the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer is until the product of measure error e (n+1) with (n+1)th grade of current transformer, therefore, the measure error e of current transformer is much smaller compared with the measure error e1 of the 1st grade of current transformer.
Preferably, when n equals 2, current transformer comprises main magnetic core, 1st auxiliary magnetic core, 2nd auxiliary magnetic core, primary winding, secondary coil, 1st ancillary coil, 2nd ancillary coil, be connected to the load resistance at secondary coil two ends, be connected to the 1st ancillary coil two ends the 1st detects resistance, be connected to the 2nd ancillary coil two ends the 2nd detects resistance, 1st ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 1st ancillary coil and the number of turn of secondary coil, 2nd ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 2nd ancillary coil and the number of turn of secondary coil, primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 1st ancillary coil is wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 2nd ancillary coil is wound on the 2nd auxiliary magnetic core, the Same Name of Ends of secondary coil is connected with the non-same polarity of the 1st ancillary coil, and the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, the two ends of primary winding are current input terminal, and the Same Name of Ends of the 2nd ancillary coil and the non-same polarity of secondary coil are signal output part, or the Same Name of Ends of the 2nd ancillary coil and the two ends of secondary coil are signal output part, use when being three-polar output signal when needing the output of current transformer.
Voltage between the Same Name of Ends of the 2nd ancillary coil and the non-same polarity of secondary coil is:
U＝(Np/Ns)*Ip*R*(1-e1*e2*e3)
U＝(Np/Ns)*Ip*R*(1-e)
e＝e1*e2*e3
Voltage between the Same Name of Ends of the U: the 2 ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and is negative value.
The measure error e of current transformer is the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer and the product of the measure error e3 with 3rd level current transformer, therefore, the measure error e of current transformer is much smaller compared with the measure error e1 of the 1st grade of current transformer.
Technical scheme three: a kind of current transformer, comprising: main magnetic core, auxiliary magnetic core, primary winding, secondary coil, ancillary coil, primary winding and secondary coil are wound on main magnetic core and auxiliary magnetic core, and ancillary coil is wound on auxiliary magnetic core;
The two ends of primary winding are current input terminal, and the two ends of ancillary coil and the two ends of secondary coil are signal output part; Or the non-same polarity of ancillary coil is connected with the Same Name of Ends of secondary coil; The Same Name of Ends of ancillary coil and the two ends of secondary coil are signal output part.
During use, if when the non-same polarity of the ancillary coil of current transformer is not connected with the Same Name of Ends of secondary coil, should connect in external circuit, the two ends of the secondary coil of current transformer are connected with the load resistance in external circuit, the two ends of the ancillary coil of current transformer are connected with the detection resistance in external circuit, when the resistance of detection resistance of selection and the ratio of the resistance of load resistance equal the ratio of the number of turn of ancillary coil and the number of turn of secondary coil, the voltage between the Same Name of Ends of ancillary coil and the non-same polarity of secondary coil is:
U＝(Np/Ns)*Ip*R*(1-e1*e2)
U＝(Np/Ns)*Ip*R*(1-e)
e＝e1*e2
Wherein:
U: the voltage between the Same Name of Ends of ancillary coil and the non-same polarity of secondary coil.
Np: the number of turn of primary winding;
Ns: the number of turn of secondary coil;
Ip: the electric current in primary winding;
R: load resistance;
The measure error of e1: the 1 grade of current transformer
The measure error of e2: the 2 grade of current transformer
The measure error of current transformer is: e, and is negative value.
The measure error e of current transformer is the product of the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer, and therefore, the measure error e of current transformer is much smaller compared with the measure error e1 of the 1st grade of current transformer.
The sectional area of auxiliary magnetic core can be less than the sectional area of main magnetic core, thus reduces the materials'use amount of current transformer, reduces the manufacturing cost of current transformer.
Technical scheme four: a kind of current transformer, comprise main magnetic core, a n auxiliary magnetic core, primary winding, secondary coil, a n ancillary coil, n be more than or equal to 2 integer, primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n-th auxiliary magnetic core, by that analogy, until the n-th ancillary coil is wound on the n-th auxiliary magnetic core; The Same Name of Ends of secondary coil is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, until the Same Name of Ends of the (n-1)th ancillary coil is connected with the non-same polarity of the n-th ancillary coil; The two ends of primary winding are current input terminal, and the Same Name of Ends of n ancillary coil and the two ends of secondary coil are signal output part.
During use, the two ends of the secondary coil of current transformer are connected with the load resistance in external circuit, the Same Name of Ends of the secondary coil of current transformer detects resistance with the Same Name of Ends of the 1st ancillary coil with the 1st in external circuit and is connected, the Same Name of Ends of the 1st ancillary coil of current transformer detects resistance with the Same Name of Ends of the 2nd ancillary coil with the 2nd in external circuit and is connected, by that analogy, until the Same Name of Ends of the (n-1)th ancillary coil of current transformer detects resistance with the Same Name of Ends of the n-th ancillary coil and n-th in external circuit is connected;
When the 1st ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 1st ancillary coil and the number of turn of secondary coil, 2nd ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 2nd ancillary coil and the number of turn of secondary coil, by that analogy, until when the n-th ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the n-th ancillary coil and the number of turn of secondary coil, then the voltage between the Same Name of Ends of the n-th ancillary coil and the non-same polarity of secondary coil is:
U＝(Np/Ns)*Ip*R*[1-e1*e2*……*e(n+1)]
U＝(Np/Ns)*Ip*R*(1-e)
e＝e1*e2*……*e(n+1)
Voltage between the Same Name of Ends of the U: the n-th ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and is negative value.
The measure error e of current transformer is that the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer is until the product of measure error e (n+1) with (n+1)th grade of current transformer, therefore, the measure error e of current transformer is much smaller compared with the measure error e1 of the 1st grade of current transformer.
Preferably, when n equals 2, current transformer comprises main magnetic core, the 1st auxiliary magnetic core, the 2nd auxiliary magnetic core, primary winding, secondary coil, the 1st ancillary coil, the 2nd ancillary coil, primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, 1st ancillary coil is wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 2nd ancillary coil is wound on the 2nd auxiliary magnetic core; The non-same polarity of the 1st ancillary coil is connected with the Same Name of Ends of secondary coil, and the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil; The two ends of primary winding are current input terminal, and the Same Name of Ends of the 2nd ancillary coil, the Same Name of Ends of the 1st ancillary coil and the two ends of secondary coil are signal output part.
During use, the two ends of the secondary coil of current transformer are connected with the load resistance in external circuit, the Same Name of Ends of the secondary coil of current transformer detects resistance with the Same Name of Ends of the 1st ancillary coil with the 1st in external circuit and is connected, and the Same Name of Ends of the 1st ancillary coil of current transformer detects resistance with the Same Name of Ends of the 2nd ancillary coil with the 2nd in external circuit and is connected;
The ratio detecting the resistance of resistance and the resistance of load resistance when selection the 1st equals the ratio of the number of turn of the 1st ancillary coil and the number of turn of secondary coil, when 2nd ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 2nd ancillary coil and the number of turn of secondary coil, then the voltage between the Same Name of Ends of the 2nd ancillary coil and the non-same polarity of secondary coil is:
U＝(Np/Ns)*Ip*R*(1-e1*e2*e3)
U＝(Np/Ns)*Ip*R*(1-e)
e＝e1*e2*e3
Voltage between the Same Name of Ends of the U: the n-th ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and is negative value.
The measure error e of current transformer is that the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer is until the product of measure error e3 with 3rd level current transformer, therefore, the measure error e of current transformer is much smaller compared with the measure error e1 of the 1st grade of current transformer.
Use magnetic core lap wound structure in above technical scheme, in addition, magnetic core separate type can also be adopted, be i.e. coiling on magnetic core respectively, then the magnetic core of good for coiling coil is put together, and coil is connected on request.
Technical scheme five: a kind of current transformer, comprises the load resistance of the Same Name of Ends of main magnetic core, auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, ancillary coil, the non-same polarity being connected to secondary coil the 1st winding and secondary coil the 2nd winding, is connected to the detection resistance at ancillary coil two ends; The ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of ancillary coil and the number of turn of secondary coil the 2nd winding, and the ratio of the number of turn of primary winding the 1st winding and the number of turn of secondary coil the 1st winding equals the ratio of the number of turn of primary winding the 2nd winding and the number of turn of secondary coil the 2nd winding; Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, and primary winding the 2nd winding and secondary coil the 2nd winding and ancillary coil are wound on auxiliary magnetic core;
The Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, and the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of ancillary coil;
The non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, and the non-same polarity of the Same Name of Ends of ancillary coil and secondary coil the 1st winding is signal output part; Or the non-same polarity of the Same Name of Ends of ancillary coil, the Same Name of Ends of secondary coil the 2nd winding and secondary coil the 1st winding is signal output part, uses when being three-polar output signal when needing the output of current transformer.
The 1st grade of current transformer is formed by main magnetic core, primary winding the 1st winding, secondary coil the 1st winding, secondary coil the 2nd winding and load resistance.
The 2nd grade of current transformer is formed by auxiliary magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding, ancillary coil and detection resistance.
For the 1st grade of current transformer and the 2nd grade of current transformer, there is following equation:
Ip*Np1-I1*Ns1-Iz1*Ns1＝0
Ip*Np2-I1*Ns2-I2*Nf-Iz2*Nf＝0
Np1/Ns1＝Np2/Ns2
Iz1＝E1/Z1
E1+E2＝I1*R01+I1*R
Iz2＝E2/Z2
E2＝I2*R02+I2*Rf
Rf/R＝Nf/Ns2
Wherein:
Np1: the number of turn of primary winding the 1st winding;
Ns1: the number of turn of secondary coil the 1st winding;
Np2: the number of turn of primary winding the 2nd winding;
Ns2: the number of turn of secondary coil the 2nd winding;
Nf: the number of turn of ancillary coil;
Ip: the electric current in primary winding the 1st winding and primary winding the 2nd winding;
I1: the electric current in secondary coil the 1st winding and secondary coil the 2nd winding;
I2: the electric current in ancillary coil;
Iz1: the exciting current of main magnetic core;
Iz2: the exciting current of auxiliary magnetic core;
E1: the induced potential on secondary coil the 1st winding;
E2: the induced potential on secondary coil the 2nd winding;
Z1: the excitation impedance of main magnetic core;
Z2: the excitation impedance of auxiliary magnetic core;
R01: total coil impedance of secondary coil the 1st winding and secondary coil the 2nd winding;
R02: the impedance of ancillary coil;
R: load resistance;
Rf: detect resistance;
Solve above equation, then can obtain:
I1＝(Np1/Ns1)*Ip*(1-e1)
I2＝(Np2/Nf)*Ip*e1*(1-e2)
e1＝[(R01+R)/Z1]/[1+(R01+R)/Z1+k]
e2＝[(R02+Rf)/Z2]/[1+(R02+Rf)/Z2]
k＝(Ns2/Nf)*(Z2/Z1)*e2
Voltage between the non-same polarity of the Same Name of Ends of ancillary coil and secondary coil the 1st winding is:
U＝I1*R+I2*Rf
U＝(Np1/Ns1)*Ip*R*(1-e1*e2)
U＝(Np1/Ns1)*Ip*R*(1-e)
e＝e1*e2
U: the voltage between the Same Name of Ends of ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and is negative value.
The measure error e of current transformer is the product of the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer, and therefore, the measure error e of current transformer is much smaller compared with the measure error e1 of the 1st grade of current transformer.
In addition, for the 2nd grade of current transformer, following equation is had:
Ip*Np2-I1*Ns2-I2*Nf-Iz2*Nf＝0
Due to: I1=(Np1/Ns1) * Ip* (1-e1)=(Np2/Ns2) * Ip* (1-e1)
Therefore have: (Ip*e1) * Np2 – I2*Nf-Iz2*Nf=0
Namely the 2nd grade of current transformer is for the detection to electric current (Ip*e1), because electric current (Ip*e1) is more much smaller than the electric current I p in the input primary winding of the 1st grade of current transformer, therefore, the magnetic core that the magnetic core of the 2nd grade of current transformer can use small cross sections long-pending, namely the sectional area of auxiliary magnetic core can be less than the sectional area of main magnetic core, thus reduce the materials'use amount of current transformer, reduce the manufacturing cost of current transformer.
Technical scheme six: a kind of current transformer, the load resistance comprising the Same Name of Ends of main magnetic core, a n auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, a n ancillary coil, the non-same polarity being connected to secondary coil the 1st winding and secondary coil the 2nd winding, be connected to the 1st ancillary coil two ends the 1st detect resistance, be connected to the 2nd ancillary coil two ends the 2nd detect resistance until be connected to the n-th ancillary coil two ends n-th detect resistance, n be more than or equal to 2 integer;
1st ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 1st ancillary coil and the number of turn of secondary coil the 2nd winding, 2nd ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 2nd ancillary coil and the number of turn of secondary coil the 2nd winding, by that analogy, until the n-th ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the n-th ancillary coil and the number of turn of secondary coil the 2nd winding, the ratio of the number of turn of primary winding the 1st winding and the number of turn of secondary coil the 1st winding equals the ratio of the number of turn of primary winding the 2nd winding and the number of turn of secondary coil the 2nd winding,
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, primary winding the 2nd winding and secondary coil the 2nd winding technique are on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n-th auxiliary magnetic core, by that analogy, until the n-th ancillary coil is wound on the n-th auxiliary magnetic core;
The Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, until the Same Name of Ends of the (n-1)th ancillary coil is connected with the non-same polarity of the n-th ancillary coil;
The non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, and the non-same polarity of the Same Name of Ends of the n-th ancillary coil and secondary coil the 1st winding is signal output part; Or the Same Name of Ends of the Same Name of Ends of the n-th ancillary coil, the non-same polarity of secondary coil the 1st winding, secondary coil the 2nd winding is signal output part, uses when being three-polar output signal when needing the output of current transformer.
The 1st grade of current transformer is formed by main magnetic core, primary winding the 1st winding, secondary coil the 1st winding, secondary coil the 2nd winding and load resistance.
Detected resistance formed the 2nd grade of current transformer by the 1st auxiliary magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding, the 1st ancillary coil and the 1st.
Detected resistance formed 3rd level current transformer by the 2nd auxiliary magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding, the 1st ancillary coil, the 2nd ancillary coil and the 2nd.
By that analogy, until:
(n+1)th grade of current transformer is formed until the n-th ancillary coil and n-th detects resistance by the n-th auxiliary magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding, the 1st ancillary coil.
For the 1st grade of current transformer and the 2nd grade of current transformer, there is following equation:
Ip*Np1-I1*Ns1-Iz1*Ns1＝0
Ip*Np2-I1*Ns2-I2*Nf1-Iz2*Nf1＝0
Np1/Ns1＝Np2/Ns2
Iz1＝E1/Z1
E1+E2＝I1*R01+I1*R
Iz2＝E2/Z2
E2＝I2*R02+I2*Rf1
Rf1/R＝Nf1/Ns2
Wherein:
Np1: the number of turn of primary winding the 1st winding;
Ns1: the number of turn of secondary coil the 1st winding;
Np2: the number of turn of primary winding the 2nd winding;
Ns2: the number of turn of secondary coil the 2nd winding;
The number of turn of the Nf1: the 1 ancillary coil;
Ip: the electric current in primary winding the 1st winding and primary winding the 2nd winding;
I1: the electric current in secondary coil the 1st winding and secondary coil the 2nd winding;
Electric current in I2: the 1 ancillary coil;
Iz1: the exciting current of main magnetic core;
The exciting current of the Iz2: the 1 auxiliary magnetic core;
E1: the induced potential on secondary coil the 1st winding;
E2: the induced potential on secondary coil the 2nd winding;
Z1: the excitation impedance of main magnetic core;
The excitation impedance of the Z2: the 1 auxiliary magnetic core;
R01: total coil impedance of secondary coil the 1st winding and secondary coil the 2nd winding;
The coil impedance of the R02: the 1 auxiliary magnetic core;
R: load resistance;
Rf1: the 1 detects resistance;
Solve above equation, then can obtain:
I1＝(Np1/Ns1)*Ip*(1-e1)
I2＝(Np2/Nf1)*Ip*e1*(1-e2)
e1＝[(R01+R)/Z1]/[1+(R01+R)/Z1+k]
e2＝[(R02+Rf1)/Z2]/[1+(R02+Rf1)/Z2]
k＝(Ns2/Nf1)*(Z2/Z1)*e2
By that analogy, until:
For (n+1)th grade of current transformer, there is following equation:
Ip*Np-I1*Ns-I2*Nf1–……–I(n+1)*Nfn–Iz(n+1)*Nfn＝0
Iz(n+1)＝E(n+1)/Z(n+1)
E(n+1)＝I(n+1)*R0(n+1)+I(n+1)*Rfn
Rfn/R＝Nfn/Ns
Wherein:
The number of turn of the Nfn: the n-th ancillary coil;
I (n+1): the electric current in the n-th ancillary coil;
Iz (n+1): the exciting current of the n-th auxiliary magnetic core;
E (n+1): the induced potential on the n-th ancillary coil;
Z (n+1): the excitation impedance of the n-th auxiliary magnetic core;
R0 (n+1): the coil impedance of the n-th auxiliary magnetic core;
Rfn: the n-th detects resistance;
Solve above equation, then can obtain:
I(n+1)＝(Np/Nfn)*Ip*e1*e2*……*[1-e(n+1)]
e(n+1)＝{[R0(n+1)+Rfn]/Z(n+1)}/{1+[R0(n+1)+Rfn)]/Z(n+1)}
The measure error of (n+1) level current transformer is: e (n+1), and is negative value.
Because the 1st ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 1st ancillary coil and the number of turn of secondary coil, 2nd ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 2nd ancillary coil and the number of turn of secondary coil, by that analogy, until the n-th ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the n-th ancillary coil and the number of turn of secondary coil, therefore have:
Rf1/R＝Nf1/Ns
Rf2/R＝Nf2/Ns
By that analogy, until:
Rfn/R＝Nfn/Ns
Voltage between the Same Name of Ends of the n-th ancillary coil and the non-same polarity of secondary coil is:
U＝I1*R+I2*Rf1+……+I(n+1)*Rfn
U＝(Np/Ns)*Ip*R*[1-e1*e2*……*e(n+1)]
U＝(Np/Ns)*Ip*R*(1-e)
e＝e1*e2*……*e(n+1)
Voltage between the Same Name of Ends of the U: the n-th ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and is negative value.
The measure error e of current transformer is that the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer is until the product of measure error e (n+1) with (n+1)th grade of current transformer, therefore, the measure error e of current transformer is much smaller compared with the measure error e1 of the 1st grade of current transformer.
Preferably, when n equals 2, current transformer comprise the Same Name of Ends of main magnetic core, the 1st auxiliary magnetic core, the 2nd auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, the 1st ancillary coil, the 2nd ancillary coil, the non-same polarity being connected to secondary coil the 1st winding and secondary coil the 2nd winding load resistance, be connected to the 1st ancillary coil two ends the 1st detect resistance, be connected to the 2nd ancillary coil two ends the 2nd detect resistance; 1st ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 1st ancillary coil and the number of turn of secondary coil the 2nd winding, 2nd ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 2nd ancillary coil and the number of turn of secondary coil the 2nd winding, and the ratio of the number of turn of primary winding the 1st winding and the number of turn of secondary coil the 1st winding equals the ratio of the number of turn of primary winding the 2nd winding and the number of turn of secondary coil the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, primary winding the 2nd winding and secondary coil the 2nd winding technique are on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, 1st ancillary coil is wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 2nd ancillary coil is wound on the 2nd auxiliary magnetic core;
The Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, and the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil;
The non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, and the Same Name of Ends of the 2nd ancillary coil and the non-same polarity of secondary coil the 1st winding are signal output part; Or the Same Name of Ends of the Same Name of Ends of the 2nd ancillary coil, the non-same polarity of secondary coil the 1st winding, secondary coil the 2nd winding is signal output part, uses when being three-polar output signal when needing the output of current transformer.
Voltage between the Same Name of Ends of the 2nd ancillary coil and the non-same polarity of secondary coil the 1st winding is:
U＝(Np/Ns)*Ip*R*(1-e1*e2*e3)
U＝(Np/Ns)*Ip*R*(1-e)
e＝e1*e2*e3
Voltage between the Same Name of Ends of the U: the 2 ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and is negative value.
The measure error e of current transformer is the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer and the product of the measure error e3 with 3rd level current transformer, therefore, the measure error e of current transformer is much smaller compared with the measure error e1 of the 1st grade of current transformer.
Technical scheme seven: a kind of current transformer, comprise main magnetic core, auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, ancillary coil, primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, and primary winding the 2nd winding and secondary coil the 2nd winding and secondary coil the 2nd winding and ancillary coil are wound on auxiliary magnetic core;
The Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, and the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding;
The ratio of the number of turn of primary winding the 1st winding and the number of turn of secondary coil the 1st winding equals the ratio of the number of turn of primary winding the 2nd winding and the number of turn of secondary coil the 2nd winding;
The non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, and the Same Name of Ends of the two ends of ancillary coil and secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are as signal output part; Or the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of ancillary coil, the non-same polarity of the two ends of ancillary coil and secondary coil the 1st winding is as signal output part.
During use, if the Same Name of Ends of secondary coil the 2nd winding is not connected with the non-same polarity of ancillary coil, then should connect in external circuit, the non-same polarity of secondary coil the 1st winding is connected with the load resistance in external circuit with the Same Name of Ends of secondary coil the 2nd winding, ancillary coil two ends are connected with the detection resistance in external circuit, when the ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of ancillary coil and the number of turn of secondary coil the 2nd winding, voltage between the non-same polarity of the Same Name of Ends of ancillary coil and secondary coil the 1st winding is:
U＝(Np1/Ns1)*Ip*R*(1-e1*e2)
U＝(Np1/Ns1)*Ip*R*(1-e)
e＝e1*e2
Np1: the number of turn of primary winding the 1st winding;
Ns1: the number of turn of secondary coil the 1st winding;
Ip: the electric current in primary winding the 1st winding and primary winding the 2nd winding;
R: load resistance;
The measure error of e1: the 1 grade of current transformer
The measure error of e2: the 2 grade of current transformer
U: the voltage between the Same Name of Ends of ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and is negative value.
The measure error e of current transformer is the product of the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer, and therefore, the measure error e of current transformer is much smaller compared with the measure error e1 of the 1st grade of current transformer.
The sectional area of auxiliary magnetic core can be less than the sectional area of main magnetic core, thus reduces the materials'use amount of current transformer, reduces the manufacturing cost of current transformer.
Technical scheme eight: a kind of current transformer, comprises main magnetic core, a n auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, a n ancillary coil, n be more than or equal to 2 integer; The ratio of the number of turn of primary winding the 1st winding and the number of turn of secondary coil the 1st winding equals the ratio of the number of turn of primary winding the 2nd winding and the number of turn of secondary coil the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, primary winding the 2nd winding and secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n-th auxiliary magnetic core, by that analogy, until the n-th ancillary coil is wound on the n-th auxiliary magnetic core;
The Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, until the ancillary coil Same Name of Ends of (n-1)th is connected with the non-same polarity of the n-th ancillary coil;
The non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, and the Same Name of Ends of the 1st ancillary coil, the Same Name of Ends of the 2nd ancillary coil are until the Same Name of Ends of the n-th ancillary coil, the Same Name of Ends of secondary coil the 2nd winding, the non-same polarity of secondary coil the 1st winding are signal output part.
During use, the non-same polarity of secondary coil the 1st winding is connected with the load resistance in the non-same polarity external circuit of ancillary coil, 1st ancillary coil two ends are detected resistance with the 1st in external circuit and are connected, 2nd ancillary coil two ends are detected resistance with the 2nd in external circuit and are connected, by that analogy, until the n-th ancillary coil two ends and n-th in external circuit detect resistance is connected;
When the 1st ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 1st ancillary coil and the number of turn of secondary coil, 2nd ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 2nd ancillary coil and the number of turn of secondary coil, by that analogy, until when the n-th ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the n-th ancillary coil and the number of turn of secondary coil;
Voltage between the non-same polarity of the Same Name of Ends of the n-th ancillary coil and secondary coil the 1st winding is:
U＝(Np1/Ns1)*Ip*R*[1-e1*e2*……*e(n+1)]
U＝(Np/Ns)*Ip*R*(1-e)
e＝e1*e2*……*e(n+1)
Voltage between the non-same polarity of the Same Name of Ends of the U: the n-th ancillary coil and secondary coil the 1st winding
The measure error of current transformer is: e, and is negative value.
The measure error e of current transformer is that the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer is until the product of measure error e (n+1) with (n+1)th grade of current transformer, therefore, the measure error e of current transformer is much smaller compared with the measure error e1 of the 1st grade of current transformer.
Preferably, when n equals 2, current transformer comprises main magnetic core, the 1st auxiliary magnetic core, the 2nd auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, the 1st ancillary coil, the 2nd ancillary coil; The ratio of the number of turn of primary winding the 1st winding and the number of turn of secondary coil the 1st winding equals the ratio of the number of turn of primary winding the 2nd winding and the number of turn of secondary coil the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, and primary winding the 2nd winding, secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 2nd ancillary coil is wound on the 2nd auxiliary magnetic core;
The Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, and the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil;
The non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, and the Same Name of Ends of the Same Name of Ends of the 1st ancillary coil, the Same Name of Ends of the 2nd ancillary coil, secondary coil the 2nd winding, the non-same polarity of secondary coil the 1st winding are signal output part.
During use, the non-same polarity of secondary coil the 1st winding is connected with the load resistance in external circuit with the Same Name of Ends of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding detects resistance with the Same Name of Ends of the 1st ancillary coil with the 1st in external circuit and is connected, and the Same Name of Ends of the 1st ancillary coil detects resistance with the Same Name of Ends of the 2nd ancillary coil with the 2nd in external circuit and is connected;
When the 1st ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 1st ancillary coil and the number of turn of secondary coil the 2nd winding, when the 2nd ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 2nd ancillary coil and the number of turn of secondary coil the 2nd winding;
Voltage between the Same Name of Ends of the 2nd ancillary coil and the non-same polarity of secondary coil the 1st winding is:
U＝(Np1/Ns1)*Ip*R*(1-e1*e2*e3)
U＝(Np1/Ns1)*Ip*R*(1-e)
e＝e1*e2*e3
Voltage between the Same Name of Ends of the U: the 2 ancillary coil and the non-same polarity of secondary coil the 1st winding
The measure error of current transformer is: e, and is negative value.
The measure error e of current transformer is the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer and the product of the measure error e3 with 3rd level current transformer, therefore, the measure error e of current transformer is much smaller compared with the measure error e1 of the 1st grade of current transformer.
In above-mentioned all technical schemes, can more preferably: the sectional area of auxiliary magnetic core is less than the sectional area of main magnetic core, thus reduce the materials'use amount of current transformer, reduce the manufacturing cost of current transformer.
Current transformer of the present invention has the high feature of certainty of measurement.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of conventional current instrument transformer.
Fig. 2 is the schematic diagram of the embodiment of the present invention 1.
Fig. 3 is the schematic diagram of the embodiment of the present invention 2.
Fig. 4 is the schematic diagram of the embodiment of the present invention 3.
Fig. 5 is the schematic diagram of the embodiment of the present invention 4.
Fig. 6 is the schematic diagram of the embodiment of the present invention 5.
Fig. 7 is the schematic diagram of the embodiment of the present invention 6.
Fig. 8 is the schematic diagram of the embodiment of the present invention 7.
Fig. 9 is the schematic diagram of the embodiment of the present invention 8.
Figure 10 is the schematic diagram of the embodiment of the present invention 9.
Figure 11 is the schematic diagram of the embodiment of the present invention 10.
Figure 12 is the schematic diagram of the embodiment of the present invention 11.
Figure 13 is the schematic diagram of the embodiment of the present invention 12.
Figure 14 is the schematic diagram of the embodiment of the present invention 13.
Figure 15 is the schematic diagram of the embodiment of the present invention 14.
Figure 16 is the schematic diagram of the embodiment of the present invention 15.
Figure 17 is the schematic diagram of the embodiment of the present invention 16.
Figure 18 is the schematic diagram of the embodiment of the present invention 17.
Figure 19 is the schematic diagram of the embodiment of the present invention 18.
Figure 20 is the schematic diagram of the embodiment of the present invention 19.
Figure 21 is the schematic diagram of the embodiment of the present invention 20.
Note: the end that in each figure, coil indicates " * " is Same Name of Ends, the other end is non-same polarity.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1: as shown in Figure 2, the present embodiment current transformer comprises: main magnetic core 1, auxiliary magnetic core 2, primary winding 3, secondary coil 4, ancillary coil 5, be connected to the load resistance 6 at secondary coil 4 two ends, be connected to the detection resistance 7 at ancillary coil 5 two ends, the resistance detecting resistance equals the resistance of load resistance, the number of turn of ancillary coil equals the number of turn of secondary coil, primary winding and secondary coil are wound on main magnetic core and auxiliary magnetic core, ancillary coil is wound on auxiliary magnetic core, the non-same polarity of ancillary coil is connected with the Same Name of Ends of secondary coil, the two ends of primary winding are current input terminal, the Same Name of Ends of ancillary coil and the non-same polarity of secondary coil are signal output part.
Voltage between the Same Name of Ends of ancillary coil and the non-same polarity of secondary coil is:
U＝(Np/Ns)*Ip*R*(1-e1*e2)
The measure error of current transformer is the product of the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer.
The sectional area of auxiliary magnetic core is less than the sectional area of main magnetic core.
Embodiment 2: as shown in Figure 3, the present embodiment is on the basis of embodiment 1, the Same Name of Ends setting up secondary coil is signal output part, namely the non-same polarity of the Same Name of Ends of ancillary coil, the Same Name of Ends of secondary coil and secondary coil is signal output part, uses when being three-polar output signal when needing the output of current transformer.
Embodiment 3: as shown in Figure 4, the present embodiment current transformer comprises: main magnetic core 1, 1st auxiliary magnetic core 2, 2nd auxiliary magnetic core 8, primary winding 3, secondary coil 4, 1st ancillary coil 5, 2nd ancillary coil 9, be connected to the load resistance 6 at secondary coil 4 two ends, be connected to the 1st ancillary coil 5 two ends the 1st detects resistance 7, be connected to the 2nd ancillary coil 9 two ends the 2nd detects resistance 10, 1st resistance detecting resistance equals the resistance of load resistance, 2nd resistance detecting resistance equals the resistance of load resistance, the number of turn of the 1st ancillary coil equals the number of turn of secondary coil, the number of turn of the 2nd ancillary coil equals the number of turn of secondary coil, primary winding and secondary coil are wound in main magnetic core, on 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, 1st ancillary coil is wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core, the non-same polarity of the 1st ancillary coil is connected with the Same Name of Ends of secondary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, the two ends of primary winding are current input terminal, the Same Name of Ends of the 2nd ancillary coil and the non-same polarity of secondary coil are signal output part.
Voltage between the Same Name of Ends of the 2nd ancillary coil and the non-same polarity of secondary coil is:
U＝(Np/Ns)*Ip*R*(1-e1*e2*e3)
The measure error of current transformer is the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer and the product of the measure error e3 with 3rd level current transformer.
Embodiment 4: as shown in Figure 5, the present embodiment is on the basis of embodiment 3, the Same Name of Ends setting up secondary coil is signal output part, namely the non-same polarity of the Same Name of Ends of the 2nd ancillary coil, the Same Name of Ends of secondary coil and secondary coil is signal output part, uses when being three-polar output signal when needing the output of current transformer.
Embodiment 5: as shown in Figure 6, the present embodiment current transformer comprises: main magnetic core 1, 1st auxiliary magnetic core 2, 2nd auxiliary magnetic core 8, until the n-th auxiliary magnetic core 11, primary winding 3, secondary coil 4, 1st ancillary coil 5, 2nd ancillary coil 9, until the n-th ancillary coil 12, be connected to the load resistance 6 at secondary coil 4 two ends, be connected to the 1st ancillary coil 5 two ends the 1st detects resistance 7, be connected to the 2nd ancillary coil 9 two ends the 2nd detects resistance 10, until be connected to the n-th ancillary coil 12 two ends n-th detects resistance 13, n be more than or equal to 2 integer, 1st resistance detecting resistance equals the resistance of load resistance, 2nd resistance detecting resistance equals the resistance of load resistance, by that analogy, until the n-th resistance detecting resistance equals the resistance of load resistance, the number of turn of the 1st ancillary coil equals the number of turn of secondary coil, the number of turn of the 2nd ancillary coil equals the number of turn of secondary coil, by that analogy, until the number of turn of the n-th ancillary coil equals the number of turn of secondary coil, primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n-th auxiliary magnetic core, by that analogy, until the n-th ancillary coil is wound on the n-th auxiliary magnetic core, the Same Name of Ends of secondary coil is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, until the Same Name of Ends of the (n-1)th ancillary coil is connected with the non-same polarity of the n-th ancillary coil, the two ends of primary winding are current input terminal, and the Same Name of Ends of the n-th ancillary coil and the non-same polarity of secondary coil are signal output part.
Voltage between the Same Name of Ends of the n-th ancillary coil and the non-same polarity of secondary coil is:
U＝(Np/Ns)*Ip*R*[1-e1*e2*……*e(n+1)]
The measure error of current transformer is that the measure error e2 of measure error e1 and the 2nd grade current transformer of the 1st grade of current transformer is until the product of measure error e (n+1) with (n+1) level current transformer.
Embodiment 6: as shown in Figure 7, the present embodiment is on the basis of embodiment 5, the Same Name of Ends setting up secondary coil is signal output part, namely the non-same polarity of the Same Name of Ends of the n-th ancillary coil, the Same Name of Ends of secondary coil and secondary coil is signal output part, uses when being three-polar output signal when needing the output of current transformer.
Embodiment 7: as shown in Figure 8, the present embodiment current transformer comprises: main magnetic core 1, auxiliary magnetic core 2, primary winding 3, secondary coil 4, ancillary coil 5, the number of turn of ancillary coil equals the number of turn of secondary coil, primary winding and secondary coil are wound on main magnetic core and auxiliary magnetic core, ancillary coil is wound on auxiliary magnetic core, the Same Name of Ends of secondary coil is connected with the non-same polarity of ancillary coil, the two ends of primary winding are current input terminal, and the Same Name of Ends of ancillary coil and the two ends of secondary coil are signal output part.
Embodiment 8: as shown in Figure 9, the present embodiment current transformer comprises: main magnetic core 1, auxiliary magnetic core 2, primary winding 3, secondary coil 4, ancillary coil 5, the number of turn of ancillary coil equals the number of turn of secondary coil, primary winding and secondary coil are wound on main magnetic core and auxiliary magnetic core, ancillary coil is wound on auxiliary magnetic core, the two ends of primary winding are current input terminal, and the two ends of ancillary coil and the two ends of secondary coil are signal output part.
Embodiment 9: as shown in Figure 10, the present embodiment current transformer comprises: main magnetic core 1, 1st auxiliary magnetic core 2, 2nd auxiliary magnetic core 8, primary winding 3, secondary coil 4, 1st ancillary coil 5, 2nd ancillary coil 9, the number of turn of the 1st ancillary coil equals the number of turn of secondary coil, the number of turn of the 2nd ancillary coil equals the number of turn of secondary coil, primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, 1st ancillary coil is wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core, the non-same polarity of the 1st ancillary coil is connected with the Same Name of Ends of secondary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, the two ends of primary winding are current input terminal, the Same Name of Ends of the 2nd ancillary coil, the Same Name of Ends of the 1st ancillary coil and the two ends of secondary coil are signal output part.
Embodiment 10: as shown in figure 11, the present embodiment comprises: main magnetic core 1, 1st auxiliary magnetic core 2, 2nd auxiliary magnetic core 8, until the n-th auxiliary magnetic core 11, primary winding 3, secondary coil 4, 1st ancillary coil 5, 2nd ancillary coil 9, until the n-th ancillary coil 12, n be more than or equal to 2 integer, the number of turn of the 1st ancillary coil equals the number of turn of secondary coil, the number of turn of the 2nd ancillary coil equals the number of turn of secondary coil, until the number of turn of the n-th ancillary coil equals the number of turn of secondary coil, primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n-th auxiliary magnetic core, by that analogy, until the n-th ancillary coil is wound on the n-th auxiliary magnetic core, the Same Name of Ends of secondary coil is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, until the Same Name of Ends of the (n-1)th ancillary coil is connected with the non-same polarity of the n-th ancillary coil, the two ends of primary winding are current input terminal, the Same Name of Ends of the 1st ancillary coil, the Same Name of Ends of the 2nd ancillary coil, until the two ends of the Same Name of Ends of the n-th ancillary coil and secondary coil are signal output part.
Embodiment 11: as shown in figure 12, the present embodiment current transformer comprises: main magnetic core 1, auxiliary magnetic core 2, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding 42, ancillary coil 5, be connected to the load resistance 6 of the non-same polarity of secondary coil the 1st winding 41 and the Same Name of Ends of secondary coil the 2nd winding 42, be connected to the detection resistance 7 at ancillary coil 5 two ends, the resistance detecting resistance equals the resistance of load resistance, the number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding, the number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding, the number of turn of ancillary coil equals the number of turn of secondary coil the 2nd winding, primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding and ancillary coil are wound on auxiliary magnetic core, the Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of ancillary coil, the non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, the non-same polarity of the Same Name of Ends of ancillary coil and secondary coil the 1st winding is signal output part.
Embodiment 12: as shown in figure 13, the present embodiment is on the basis of embodiment 11, the Same Name of Ends setting up secondary coil the 2nd winding is signal output part, namely the non-same polarity of the Same Name of Ends of ancillary coil, the Same Name of Ends of secondary coil the 2nd winding and secondary coil the 1st winding is signal output part, uses when being three-polar output signal when needing the output of current transformer.
Embodiment 13: as shown in figure 14, the present embodiment current transformer comprises: main magnetic core 1, 1st auxiliary magnetic core 2, 2nd auxiliary magnetic core 8, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding 42, 1st ancillary coil 5, 2nd ancillary coil 9, be connected to the load resistance 6 of the non-same polarity of secondary coil the 1st winding 41 and the Same Name of Ends of secondary coil the 2nd winding 42, be connected to the 1st ancillary coil 5 two ends the 1st detects resistance 7, be connected to the 2nd ancillary coil 9 two ends the 2nd detects resistance 10, 1st resistance detecting resistance equals the resistance of load resistance, 2nd resistance detecting resistance equals the resistance of load resistance, the number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding, the number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding, the number of turn of the 1st ancillary coil equals the number of turn of secondary coil the 2nd winding, the number of turn of the 2nd ancillary coil equals the number of turn of secondary coil the 2nd winding, primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core, the Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, the non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, the Same Name of Ends of the 2nd ancillary coil and the non-same polarity of secondary coil the 1st winding are signal output part.
Embodiment 14: as shown in figure 15, the present embodiment is on the basis of embodiment 13, the Same Name of Ends setting up secondary coil the 2nd winding is signal output part, namely the non-same polarity of the Same Name of Ends of the 2nd ancillary coil, the Same Name of Ends of secondary coil the 2nd winding and secondary coil the 1st winding is signal output part, uses when being three-polar output signal when needing the output of current transformer.
Embodiment 15: as shown in figure 16, the present embodiment current transformer comprises: main magnetic core 1, 1st auxiliary magnetic core 2, 2nd auxiliary magnetic core 8, until the n-th auxiliary magnetic core 11, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding 42, 1st ancillary coil 5, 2nd ancillary coil 9, until the n-th ancillary coil 12, be connected to the load resistance 6 of the non-same polarity of secondary coil the 1st winding 41 and the Same Name of Ends of secondary coil the 2nd winding 42, be connected to the 1st ancillary coil 5 two ends the 1st detects resistance 7, be connected to the 2nd ancillary coil 9 two ends the 2nd detects resistance 10, until be connected to the n-th ancillary coil 12 two ends n-th detects resistance 13, 1st resistance detecting resistance equals the resistance of load resistance, 2nd resistance detecting resistance equals the resistance of load resistance, until the n-th resistance detecting resistance equals the resistance of load resistance, the number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding, the number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding, the number of turn of the 1st ancillary coil equals the number of turn of secondary coil the 2nd winding, the number of turn of the 2nd ancillary coil equals the number of turn of secondary coil the 2nd winding, until the number of turn of the n-th ancillary coil equals the number of turn of secondary coil the 2nd winding, primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n-th auxiliary magnetic core, until the n-th ancillary coil is wound on the n-th auxiliary magnetic core, the Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, until the Same Name of Ends of the (n-1)th ancillary coil is connected with the non-same polarity of the n-th ancillary coil, the non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, the non-same polarity of the Same Name of Ends of the n-th ancillary coil and secondary coil the 1st winding is signal output part.
Embodiment 16: as shown in figure 17, the present embodiment is on the basis of embodiment 15, the Same Name of Ends setting up secondary coil the 2nd winding is signal output part, namely the non-same polarity of the Same Name of Ends of the n-th ancillary coil, the Same Name of Ends of secondary coil the 2nd winding and secondary coil the 1st winding is signal output part, uses when being three-polar output signal when needing the output of current transformer.
Embodiment 17: as shown in figure 18, the present embodiment current transformer comprises: main magnetic core 1, auxiliary magnetic core 2, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding 42, ancillary coil 5, the number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding, the number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding, the number of turn of ancillary coil equals the number of turn of secondary coil the 2nd winding, primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding and ancillary coil are wound on auxiliary magnetic core, the Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of ancillary coil, the non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, the Same Name of Ends of ancillary coil, the Same Name of Ends of secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are signal output part.
Embodiment 18: as shown in figure 19, the present embodiment current transformer comprises: main magnetic core 1, auxiliary magnetic core 2, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding 42, ancillary coil 5, the number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding, the number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding, the number of turn of ancillary coil equals the number of turn of secondary coil the 2nd winding, primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding and ancillary coil are wound on auxiliary magnetic core, the Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, the two ends of ancillary coil, the Same Name of Ends of secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are signal output part.
Embodiment 19: as shown in figure 20, the present embodiment current transformer comprises: main magnetic core 1, 1st auxiliary magnetic core 2, 2nd auxiliary magnetic core 8, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding 42, 1st ancillary coil 5, 2nd ancillary coil 9, the number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding, the number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding, the number of turn of the 1st ancillary coil equals the number of turn of secondary coil the 2nd winding, the number of turn of the 2nd ancillary coil equals the number of turn of secondary coil the 2nd winding, primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core, the Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, the non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, the Same Name of Ends of the 2nd ancillary coil, the Same Name of Ends of the 1st ancillary coil, the Same Name of Ends of secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are signal output part.
Embodiment 20: as shown in figure 21, the present embodiment current transformer comprises: main magnetic core 1, 1st auxiliary magnetic core 2, 2nd auxiliary magnetic core 8, until the n-th auxiliary magnetic core 11, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding 42, 1st ancillary coil 5, 2nd ancillary coil 9, until the n-th ancillary coil 12, the number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding, the number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding, the number of turn of the 1st ancillary coil equals the number of turn of secondary coil the 2nd winding, the number of turn of the 2nd ancillary coil equals the number of turn of secondary coil the 2nd winding, until the number of turn of the n-th ancillary coil equals the number of turn of secondary coil the 2nd winding, primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n-th auxiliary magnetic core, until the n-th ancillary coil is wound on the n-th auxiliary magnetic core, the Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, until the Same Name of Ends of the (n-1)th ancillary coil is connected with the non-same polarity of the n-th ancillary coil, the non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, the Same Name of Ends of the 1st ancillary coil, the Same Name of Ends of the 2nd ancillary coil, until the Same Name of Ends of the n-th ancillary coil, the Same Name of Ends of secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are signal output part.
Above the preferred embodiments of the present invention are explained in detail, for those of ordinary skill in the art, will change in above-mentioned embodiment, and these changes also should be considered as protection scope of the present invention.

Claims (7)

1. a current transformer, it is characterized in that: comprise main magnetic core, auxiliary magnetic core, primary winding, secondary coil, ancillary coil, be connected to the load resistance at secondary coil two ends, be connected to the detection resistance at ancillary coil two ends, the ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of ancillary coil and the number of turn of secondary coil, primary winding and secondary coil are wound on main magnetic core and auxiliary magnetic core, ancillary coil is wound on auxiliary magnetic core, the non-same polarity of ancillary coil is connected with the Same Name of Ends of secondary coil, the two ends of primary winding are current input terminal, the Same Name of Ends of ancillary coil and the non-same polarity of secondary coil are signal output part, or the Same Name of Ends of ancillary coil and the two ends of secondary coil are signal output part.
2. a current transformer, it is characterized in that: comprise main magnetic core, n auxiliary magnetic core, primary winding, secondary coil, n ancillary coil, be connected to the load resistance at secondary coil two ends, be connected to the 1st ancillary coil two ends the 1st detects resistance, be connected to the 2nd ancillary coil two ends the 2nd detects resistance, until be connected to the n-th ancillary coil two ends n-th detects resistance, n be more than or equal to 2 integer, 1st ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 1st ancillary coil and the number of turn of secondary coil, 2nd ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 2nd ancillary coil and the number of turn of secondary coil, by that analogy, until the n-th ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the n-th ancillary coil and the number of turn of secondary coil,
Primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n-th auxiliary magnetic core, by that analogy, until the n-th ancillary coil is wound on the n-th auxiliary magnetic core;
The Same Name of Ends of secondary coil is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, until the Same Name of Ends of the (n-1)th ancillary coil is connected with the non-same polarity of the n-th ancillary coil;
The two ends of primary winding are current input terminal, and the Same Name of Ends of the n-th ancillary coil and the non-same polarity of secondary coil are signal output part; Or the Same Name of Ends of the n-th ancillary coil and the two ends of secondary coil are signal output part.
3. a current transformer, is characterized in that: comprise the load resistance of the Same Name of Ends of main magnetic core, auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, ancillary coil, the non-same polarity being connected to secondary coil the 1st winding and secondary coil the 2nd winding, be connected to the detection resistance at ancillary coil two ends;
The ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of ancillary coil and the number of turn of secondary coil the 2nd winding, and the ratio of the number of turn of primary winding the 1st winding and the number of turn of secondary coil the 1st winding equals the ratio of the number of turn of primary winding the 2nd winding and the number of turn of secondary coil the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, and primary winding the 2nd winding and secondary coil the 2nd winding and ancillary coil are wound on auxiliary magnetic core;
The Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, and the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of ancillary coil;
The non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, and the non-same polarity of the Same Name of Ends of ancillary coil and secondary coil the 1st winding is signal output part; Or the non-same polarity of the Same Name of Ends of ancillary coil, the Same Name of Ends of secondary coil the 2nd winding and secondary coil the 1st winding is signal output part.
4. a current transformer, it is characterized in that: the load resistance comprising the Same Name of Ends of main magnetic core, a n auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, a n ancillary coil, the non-same polarity being connected to secondary coil the 1st winding and secondary coil the 2nd winding, be connected to the 1st ancillary coil two ends the 1st detect resistance, be connected to the 2nd ancillary coil two ends the 2nd detect resistance until be connected to the n-th ancillary coil two ends n-th detect resistance, n be more than or equal to 2 integer;
1st ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 1st ancillary coil and the number of turn of secondary coil the 2nd winding, 2nd ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the 2nd ancillary coil and the number of turn of secondary coil the 2nd winding, by that analogy, until the n-th ratio detecting the resistance of resistance and the resistance of load resistance equals the ratio of the number of turn of the n-th ancillary coil and the number of turn of secondary coil the 2nd winding, the ratio of the number of turn of primary winding the 1st winding and the number of turn of secondary coil the 1st winding equals the ratio of the number of turn of primary winding the 2nd winding and the number of turn of secondary coil the 2nd winding,
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, primary winding the 2nd winding and secondary coil the 2nd winding technique are on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n-th auxiliary magnetic core, by that analogy, until the n-th ancillary coil is wound on the n-th auxiliary magnetic core;
The Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, until the Same Name of Ends of the (n-1)th ancillary coil is connected with the non-same polarity of the n-th ancillary coil;
The non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, and the non-same polarity of the Same Name of Ends of the n-th ancillary coil and secondary coil the 1st winding is signal output part; Or the non-same polarity of the Same Name of Ends of the n-th ancillary coil, the Same Name of Ends of secondary coil the 2nd winding, secondary coil the 1st winding is signal output part.
5. a current transformer, is characterized in that: comprise main magnetic core, auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, ancillary coil;
The ratio of the number of turn of primary winding the 1st winding and the number of turn of secondary coil the 1st winding equals the ratio of the number of turn of primary winding the 2nd winding and the number of turn of secondary coil the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, and primary winding the 2nd winding and secondary coil the 2nd winding and ancillary coil are wound on auxiliary magnetic core;
The Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, and the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding;
The non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of ancillary coil, and the non-same polarity of the two ends of ancillary coil and secondary coil the 1st winding is as signal output part.
6. current transformer as claimed in claim 5, is characterized in that: the sectional area of auxiliary magnetic core is less than the sectional area of main magnetic core.
7. a current transformer, is characterized in that: comprise main magnetic core, a n auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, a n ancillary coil, n be more than or equal to 2 integer;
The ratio of the number of turn of primary winding the 1st winding and the number of turn of secondary coil the 1st winding equals the ratio of the number of turn of primary winding the 2nd winding and the number of turn of secondary coil the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, primary winding the 2nd winding and secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core to the n-th auxiliary magnetic core, 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n-th auxiliary magnetic core, by that analogy, until the n-th ancillary coil is wound on the n-th auxiliary magnetic core;
The Same Name of Ends of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, the Same Name of Ends of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, the Same Name of Ends of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, the Same Name of Ends of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, until the (n-1)th ancillary coil Same Name of Ends is connected with the non-same polarity of the n-th ancillary coil;
The non-same polarity of primary winding the 1st winding and the Same Name of Ends of primary winding the 2nd winding are current input terminal, and the Same Name of Ends of the 1st ancillary coil, the Same Name of Ends of the 2nd ancillary coil are until the Same Name of Ends of the n-th ancillary coil, the Same Name of Ends of secondary coil the 2nd winding, the non-same polarity of secondary coil the 1st winding are signal output part.
CN201210209079.XA 2012-06-21 2012-06-21 Current transformer Active CN102709042B (en)

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CN102709042B (en) * 2012-06-21 2015-06-10 陈德才 Current transformer
CN104090146B (en) * 2014-07-24 2017-01-18 中国科学院上海应用物理研究所 Alternating current/direct current sensor
CN104332297A (en) * 2014-09-19 2015-02-04 国家电网公司 Current transformer for microcomputer protection device
CN106298214B (en) * 2016-09-23 2018-01-09 国网江西省电力公司电力科学研究院 A kind of wide-range Zero flux current ratio converter
CN107424815B (en) * 2017-08-18 2019-04-30 陈宇斯 A kind of two-stage current transformer compensated using circle is subtracted
CN108039267B (en) 2017-11-25 2019-10-25 华为数字技术（苏州）有限公司 Current transformer
CN109683009A (en) * 2019-01-17 2019-04-26 上海崇林汽车电子有限公司 A kind of magnetic circuit device of large range high precision Hall current sensor
CN109754998B (en) * 2019-03-06 2020-07-21 陈德才 Active two-stage current transformer
CN111785510B (en) * 2020-07-01 2022-03-15 南京丹迪克电力仪表有限公司 Method for preparing high-accuracy two-stage split core type current transformer
CN113161134A (en) * 2021-04-15 2021-07-23 上海置信智能电气有限公司 anti-DC component two-stage current transformer
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